Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

45505 results found.

  1. GRB011212: Optical Observations
  2. GRB 020331: NIR Observations
  3. GRB 020331: NIR Observations
  4. GRB020331 NIR observation at KPNO (re-submission)
  5. GRB02033 NIR observation at KPNO
  6. GRB020331 field photometry
  7. GRB 020331 Optical Observations
  8. GRB 020331, NIR observations
  9. GRB 020331: Optical observations
  10. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  11. GRB 020321: Infrared observations
  12. GRB 020322: BeppoSAX observations of the X-ray afterglow
  13. SN 2002ap - peak brightness date (SN/GRB?)
  14. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  15. GRB 020322, Radio observations
  16. Near-Infrared Observations of GRB020322 at TIRGO
  17. GRB 020321, Radio Observations
  18. GRB 020322: Optical Observations
  19. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  20. GRB 020321: Optical observations
  21. GRB020317 BVRI field photometry
  22. GRB011211 revised BVRI field photometry
  23. GRB020305 BVRI field photometry
  24. GRB020322 BVRI field photometry
  25. GRB 020322 optical observations
  26. GRB020322: Candidate Optical Afterglow
  27. GRB 020322 optical observation
  28. GRB020317 : Near IR Observations from Mt Abu Observatory
  29. GRB 020322: Optical Sources and Improved Astrometry
  30. GRB020322, optical observations
  31. GRB 020322: Optical candidate
  32. XMM-Newton observation of GRB020322
  33. GRB020322: Optical Observations
  34. GRB020322: BeppoSAX/NFI Observations
  35. GRB 020321: Optical observations
  36. GRB 011121: Fourth Epoch of HST Imaging
  37. GRB020317: optical observations
  38. GRB020321 optical observations
  39. GRB020321: BeppoSAX/NFI Observations
  40. GRB020321: a faint BeppoSAX detection
  41. GRB020305: NIR observations
  42. GRB 020317 : KISO Optical Observations
  43. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  44. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  45. GRB 020305: Optical Observations
  46. GRB020317, optical observations
  47. GRB 020317: Optical observations
  48. GRB 011121: Third HST Epoch
  49. GRB020305: Properties of the Candidate Optical Afterglow
  50. GRB 011121: HST Observations reveal an intermediate-time multicolor
  51. GRB011121, possible supernova association
  52. GRB011130 (XRF011130) Second Epoch Chandra Observations
  53. GRB020305: Subaru Optical Observations
  54. GRB 020305: Optical observations
  55. XRF/GRB 011030 Images
  56. XRF/GRB 011030: Detection of the Probable Host Galaxy
  57. GRB 020305: Candidate optical afterglow
  58. Type Ic SN2002bl (SN/GRB?) Radio Observations
  59. GRB020305, optical observations
  60. GRB020305: Optical Observations
  61. IPN triangulation of GRB020305 (HETE 1939)
  62. GRB020305 (=H1939): Localization of a GRB by HETE
  63. GRB 020305: Optical observations
  64. HST Imaging of the afterglow and host of GRB 011121
  65. GRB 010921: HST Observations
  66. IPN detection and localization of Cygnus X-1 flares
  67. GRB020127: Further VLA Observations of Possible Counterparts
  68. RXTE Observations of SGR 1900+14
  69. IPN detection of further SGR1900+14 activity
  70. SGR1900+14 activity
  71. IPN/HETE Detection of Bursts from SGR1900+14
  72. IPN Upper Limits to a GRB Associated With SN2002ap
  73. GRB020124 BVRI field photometry
  74. GRB020127: Palomar and VLA Observations of Possible Counterparts
  75. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  76. SN2002ap (SN/GRB?) Echelle spectra
  77. SN2002ap (SN/GRB?) optical spectrographic observations
  78. GRB020127, WSRT radio observations
  79. GRB020127 Optical Observations
  80. SN 2002ap (SN/GRB?)
  81. SN 2002ap in M74
  82. SN2002ap (SN/GRB?) UBVRI Field Photometry
  83. GRB020127: Chandra Observations and Prospective Counterparts
  84. pre-SN2002ap (SN/GRB?) imaging of M74
  85. SN 2002ap (hypernova / GRB ??): special list on VSNET
  86. Type Ib/c SN2002ap (SN/GRB?)
  87. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  88. GRB020124, optical observations
  89. GRB020127: Optical observations
  90. GRB 020127, I-band observations starting 3.14-hr after the event
  91. IPN detection of further activity from SGR1806-20
  92. IPN triangulation of GRB020127 (=H1902)
  93. GRB020127 Optical Observations -- Erratum to GCN 1230
  94. GRB010921 Optical Observations
  95. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  96. GRB020124: Optical observations
  97. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  98. GRB020124: Optical observations
  99. GRB 020124: Optical observations
  100. GRB 020124 Optical Observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov